Simplify : $n^2(n-2) +2n^3(n+3)-6n(n-4)$

Question

$\begin{array}{1 1} 2n^4+7n^3-8n^2+24n \\ 2n^4-8n^2+24n \\ 2n^4+7n^3 \\ 2n^4-8n^2+24n \end{array} $